Remote control of heavy objects



, Spt. s, 1939.

R. BUCH EI'AL 2,172,186 REMOTE CONTROL OF HEAVY OBJECTS Filed Dec. 23, 1937 Pi .2 [Z I z; "T g' 24 lnve ntor si IVA/ 6. AWL

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Patented sea. 5, 1939 UNITED STATES PATENT OFFICE 2,172,186. REMOTE CONTROL OF HEAVY OBJECTS Rudolf Bach, Berlln-Charlottenburg, and Friedrich Hlemmerllng, Berlin-Relnickendorl', Germany, usisnon to General E c Company, a

corporation of New York Application December 23, 1937, Serial No. 181,424 In German February 27, 1936 mins.

or other heavy objects, must be controlled in exceedingly fine steps over In no case are 10 also attaining the high adjustment speeds resuch that either the durations of the separate matical representation of an embodiment of the supply generator.

rect current motor ll.

. any suitable driving means such as the motor I! which, in turn, is supplied from a suitable source -of supply (not shown).

The voltage of supply generator l2 may be adgenerator I2 is connected in a loop circuit with the armature of motor II which operates at a speed dependent upon the impressed voltage.

s connection is known as a Ward-Leonard connection.

Supply generator transmitter 18 provided with a control member 10 ouency it serves to control the duration of the impulses. The output side of the impulse transoi the supply generator.

The form of impulse transmitter disclosed in 20 Fig. 2 is a motor driven circuit interrupter. As

contacts 20 arranged in the space between the 25 stationary contacts. The movable contacts are I electrically connected to the excitation winding 2i which corresponds to the winding ii of Fig. 1. The two pairs of stationary contacts I and I9 are reversely connected to the supply source 22 which 30 corresponds to the source I5 of Fig. 1, i. e., the

and positive sides. 35

source 22 and an "eccentric 24 driven by pilot motor 23.

field circuit of pilot motor 23 for adjusting the speed or the pilot motor to any desired value.

1 for example, a lagging speeds. Furthermore,

the speed of the pilot motor remains unchanged,

the stationary contacts may be spring mounted and the distance between movable and stationary contacts varied by means of control member 25 thereby to vary the duration of each current impulse.

The advantage of the present invention resides in the great speed range produced by the impulse control, particularly in the range of the slow the arrangement has all the properties of Ward-Leonard control, so that, of the adjusting motor cannot occur.

What we claim as new and desire to secure by Letters Patent of the United States, is:

1. A system for controlling the movement of a heavy objectfrom a remote point comprising in combination,' an electric motor mechanically coupled to-said object, an adjustable voltage generator electrically connected to supply a voltage to said motor, said generator having a direct current field winding, a'direct current source, electrical connections from said source to said winding, a circuit interrupter included in said connections and having two reversely connected pairs of contacts and a third pair of contacts adapted to cooperate with said reversely connected contacts, means for selectively actuating one of said reversely connected pairs of contacts into cooperative relationship with said third pair of contacts, and an electric pilot motor for effecting successive engagements of said third pair of contacts with said pair or selectively actuated contacts thereby to supply a series of unidirectional current impulses of selected polarity to said field winding.

2. A system for controlling the movement of a heavy object from a remote point comprising in combination, an electric motor mechanically coupled to said object, an adjustable voltage generator'electrically connected to supply a voltage to said motor, saidgenerator having a direct current fieldwinding, a direct current source, electrical connections from said source to said winding, a circuit interrupter included in, said;connections comprising two reversely connectedpairs or contacts and a third pair of contacts adapted to cooperate with sa'd reversely connected .pairs of contacts, means for selectively actuating one of said reversely connected pairs of contacts into position for cooperation with said third pair of contacts, an electric pilot motor for effecting suc cessive engagements ofsaid third pair of'contacts with said selectively actuated pair of contacts thereby to supply a series of unidirectional current impulses of selected polarity to said field winding, means for varying the speed of said pilot ,motor to control the frequency of said'impulses,

and means for varying the spacing between said contacts.

RUDOLF BUCH-o' FRIEDRICH HAEMMERLING. 

